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You will often see this via SelToIndexOnTheFly but other paths exist. See my article The Eager Index Spool and The Optimizer. An index spool is a temporary index built in TempDB because the optimiser really needed an index on that column but there wasn't one. Without seeing the exec plan, it's hard to say for sure, but The reason for Table Spool operator in query plan seems to be NOT an exact science but it's in the realm of magic. I have a simple reproduction code to demonstrate an issue. if you add Performance: Show Plan XML in profiler, then you will see something like this. I have appropriate indexes and queries are really simple.

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The reason we only care about Eager Index Spools right now is that they cache the entire result set in tempdb, and index it. This makes them generally more prone to spill to disk, and means they can be … Eager Spools may be added for a variety of reasons, including for Halloween Protection, or to optimize I/O when maintaining nonclustered indexes. Without seeing (even a picture of) the execution plan, it is hard to be certain which of these scenarios might apply in your particular case.

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In a parallel plan, EXECSYNC waits are generated, but in a serial plan, you don’t see anything. Problem scenarios will become more common when FROID is released and adopted. The reason we only care about Eager Index Spools right now is that they cache the entire result set in tempdb, and index it. This makes them generally more prone to spill to disk, and means they can be blocking operations while the data is spooled and indexed.

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You will often see this via SelToIndexOnTheFly but other paths exist. See my article The Eager Index Spool and The Optimizer . The Index Spool operator is very similar to it, but indexes its data to allow it to return only a subset of the stored rows. The Row Count Spool operator is optimized … Eager Index Spools Should Generate Wait Stats In query plans where an Eager Index Spool is directly after a data access operator, wait stats should be generated while the Spool is built.

So it takes longer to build, but can be more useful when filtering or aggregating rows. There are a Jun 24, 2018 Eager Spool and Lazy Spool are logical operators. In general, we see these expressions with physical operators such as Index Spool, Table GI-DE100 is a Graded-Index cable for high-speed short-distance data communication applications.
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It retains a copy of all data it reads in an indexed worktable (in tempdb), and can then later return subsets of these rows without having to call its child operators to produce them again. The Index Spool operator is quite similar to Table Spool, except that Index Spool indexes its data, giving it the option to return a subset, and Index Spool l… 2010-06-25 2019-11-22 What is Index Spool in Execution Plan, is it something that is not desirable, because I have couple of them which are costin 70% of my query. Attachments: Up to 2 attachments (including images) can An index spool is favoured for apply because the outer reference means the selection is applied on the inner side of the join. You will often see this via SelToIndexOnTheFly but other paths exist.

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